Ignition failing to start -S280 MERCEDES BENZ 1999 MODEL

My mercedes benz is not starting even though the computer on the car is saying that there is no malfunction on the car. The battery, the hone, the lights and the electronic system are all working.What then could be the problem?

My mercedes benz is not starting even though the computer on the car issaying that there is no malfunction on the car. The battery, the hone,the lights and the electronic system are all working.What then could bethe problem?

My mercedes benz is not starting even though the computer on the car is
saying that there is no malfunction on the car. The battery, the hone,
the lights and the electronic system are all working.What then could be
the problem?

AnonymousJan 19, 2009

My car, a W140 S280 1995, starts up quite strangely. You need to press the gas pedal while turning the key. Then when it starts up you need to rev it once or twice. After that, the choke is working and the car runs smooth and quiet. Changed all filters and the spark plugs. Is this just the way this car is supposed to start? Just bought it recently. Thanks!My car, a W140 S280 1995, starts up quite strangely. You need to press the gas pedal while turning the key. Then when it starts up you need to rev it once or twice. After that, the choke is working and the car runs smooth and quiet. Changed all filters and the spark plugs. Is this just the way this car is supposed to start? Just bought it recently. Thanks!

Crank shaft position sensor is bad. This is the most common failure. Its location is on the rear drivers side of engine, where the transmission bell housing mates to the engine, only one small bolt and a two prong electrical connector hold it on. Usually will not throw a trouble code. If you remove it you can test it with an ohm meter, will have an erratic reading or read open loop, can malfunction intermittently or permanently after parking vehicle and won't restart. Applying some heat source to it during ohm testing with a hot air heat gun will usually cause the sensor to read open loop if your not sure if its bad or not. This reply is probably way to late, but I just happened to come accross it while online. Harry (master certified MBZ diagnostic tech)

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Check the crankshaft sensor again. It may have come loose, or the electrical connection may be loose. If there was physical damage to the old crankshaft sensor, the new one may have become damaged also. If everything is ok with the new sensor, scan the computer for fresh trouble codes.